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I would like to add a vented,natural gas-fueled,space heater in my basement as a backup in case of power failure. Are there units available that use PVC pipe as intake/exhaust such as my furnace does?
As far as I know the only furnaces that can use pvc exhaust are high efficiency power vented units. So I don't think so.
Note: PVC is NOT the same thing as CPVC.
Direct vent unit requires electrical power.